These pans are very sturdy though not overly heavy. Excellent selection of sizes in the trio, leakproof (tested in a darkened room with flashlight). No loose parts. Metal folded like a wrapped package and welds seem welded nicely. Used the medium for a meatloaf. Did not stick. Will try quickbread next. I oil and flourall my baking pans anyway when I bake cakes and sweet breads. I won't be puting these loaf pans in the dishwasher so I don't expect these to rust.